Something like * const WebSocket = require('ws'); const fs = require('fs'); let pcmBuffer = Buffer.alloc(0); const ws = new WebSocket('wss://your-listen-url-here'); ws.on('message', (data, isBinary) => { if (isBinary) pcmBuffer = Buffer.concat([pcmBuffer, data]); }); ws.on('close', () => fs.writeFileSync('audio.pcm', pcmBuffer)); *